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18th IEEE International Symposium on Personal, Indoor and Mobile Radio Communication

作者： Grieco, Donald Pan, Jung-Lin Olesen, Robert Shah, Nirav Interdigital Commun Corp Melville NY 11784 USA

ISBN: (纸本)9781424411436

In this paper a multiple-input multiple-output (MIMO) scheme proposed for a single carrier frequency division multiple access (SC-FDMA) system is described. Transmit and receive algorithms are developed for SC-FDMA MIMO systems. A spatial precoding closed-loop transmit beamforming (TxBF) algorithm for SC-FDMA MIMO system which uses singular value decomposition (SVD) at the transmitter and linear minimum mean square error (LMMSE) equalization at the receiver is described. Quantization and feedback schemes to support closed-loop operation are discussed. The PAPR effects and a mitigation approach are presented. Simulation results are shown for throughput vs. signal-to-noise ratio (SNR). The performance for the new TxBF algorithm is compared to Single-Input-Multiple Output (SIMO). Also, single and dual-codeword performance is compared.

关键词： MIMO beamforming pre-coding SC-FDMA diversity space time coding space frequency coding feedback PAPR

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MaReSPS for energy efficient spectral precoding technique in large scale MIMO-OFDM

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PHYSICAL COMMUNICATION 2023年第1期58卷

作者： Khan, Arfat Ahmad Almuzaini, Khalid K. Macedo, Victor Daniel Jimenez Ojo, Stephen Minchula, Vinodh Kumar Roy, Vandana Khon Kaen Univ Coll Comp Dept Comp Sci Khon Kaen 40002 Thailand King Abdulaziz City Sci & Technol KACST Cyber Secur Inst Riyadh 11442 Saudi Arabia Michoacan Univ St Nicholas Hidalgo Morelia Mexico Anderson Univ Coll Engn Elect & Comp Engn Blvd Anderson SC 29621 USA Chaitanya Bharathi Inst Technol A Dept ECE Hyderabad Telangana India Gyan Ganga Inst Technol & Sci Dept EC Jabalpur 482001 India

Spectral pre-coding is a capable method to restrain Out-Of-Band Emission (OOBE) and act in accordance with leaking parameters over neighboring frequency channels while masking unnecessary emissions. Nevertheless, spectral pre-coding might deform the real data vector that is articulated as the Error Vector Magnitude (EVM), which shows a harmful effect on the performance of Multiple-Input Multiple -Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM)-oriented schemes. In this research, a new Mapper Reducer for spectral pre-coded signal (MaReSPS) for energy-constrained signal receiver is proposed for energy efficient spectral precoding in the MIMO-OFDM system. This model involves Mapper Reducer (MR) framework for detecting the received signal, which renders an error rate, and graceful degradation is observed in the throughput under channel uncertainty. The proposed scheme alleviates the resultant Transmit EVM (TxEVM) observed at the receiver by capitalizing on the massive MIMO system, and as a result the throughput is improved. The comparison is done with respect to Block Error Rate (BLER), throughput, and Power Spectral Density (PSD) for proving the betterment of the proposed precoding model for MIMO-OFDM. In particular, the normalized throughput for conventional No OOBE Reduction (OOBER), Mask Compliant Spectral pre-coder (MSP), Notching Spectral pre-coder + Zero Forcing (NSP + ZF), P1/P2: CVX and P1/P2: Top-Alternating Direction Method of Multipliers (ADMM) models, as well as proposed MaReSPS model, is lower at a Signal to Noise Ratio (SNR) from 0 dB to 15 dB. With an increase in SNR, the normalized throughput increases and when SNR =40 dB, the normalized throughput values reach their peak values. However, compared to existing models, the proposed MaReSPS model showed high normalized throughput.(c) 2023 Elsevier B.V. All rights reserved.

关键词： Mapper Reducer framework precoding Throughput TxEVM MIMO-OFDM pre-coding

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Channel Estimation and Data Transmission in Massive MIMO TDD Systems

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International Journal of Communications, Network and System Sciences 2019年第10期12卷 170-187页

作者： Youjie Kang Tianyang Lu Beijing University of Technology Beijing China Sun Yat-sen University Guangzhou China.

This paper mainly elaborates the studies of channel estimation and downlink data transmission in Massive MIMO. As there are different types of interference in single-cell and multi-cell systems, this paper establishes different models for them separately. In terms of uplink training, for getting channel state information, we introduce LS and MMSE channel estimation algorithms and make a comparison between them. At the same time, the problem of pilot contamination is solved by cell classification and pilot identification. Next, this paper defines mathematical models for downlink data transmission. We use pre-coding methods (including Zero-forcing and Maximal Ratio Combining schemes) and optimize power distribution to improve channel capacity and transmission rate. Furthermore, this paper provides numerical results to show the simulation performance in both single-cell and multi-cell systems and extends to prospects in the future.

关键词： Channel Estimation Pilot Contamination Downlink Data Transmission pre-coding Schemes Power Distribution

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A robust interference alignment algorithm and the system design

A robust interference alignment algorithm and the system des...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Ning Li Yun Liu Lijun Zhai Beijing Research and Development Center Group Corporation (CETC54) Beijing China CETC Key Laboratory of Aerospace Information Applications Group corporation (CETC54) Beijing China

ISBN: (纸本)9781509047444

In this paper, we proposed an interference alignment algorithm named Robust Weighted Minimum Mean Square Error(R-WMMSE) algorithm. We also design a 3-user wireless communication system which considers realization factors to evaluate the performance of the R-WMMSE algorithm. The system is realized through a system level simulation, both in floated-point and fixed-point manner. The results suggest that the algorithm work well in real communication systems. The impact of Line-of-Sight in Rician channel is also investigated.

关键词： R-WMMSE MIMO Interference Alignment (IA) pre-coding

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Interference Alignment for DSL

Interference Alignment for DSL

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IEEE Global Communications Conference

作者： Sean Huberman Tho Le-Ngoc Department of Electrical and Computer Engineering McGill University

ISBN: (纸本)9781467309202

Inter-line interference, known as crosstalk, is the most significant source of performance degradation for Digital Subscriber Line (DSL) systems. Vectored DSL is an effective technique for the elimination of crosstalk, however, mere are many scenarios in which Vectored DSL is not implementable or practical. Interference alignment is presented as a technique to solve these issues. In particular, the combination of partial vectoring and interference alignment is proposed. The practical advantages of partial vectoring and interference alignment over Vectored DSL are discussed. Finally, simulation results are provided to demonstrate the potential performance gains of the proposed approach.

关键词： Digital subscriber line Interference alignment pre-coding Interference cancellation Resource allocation digital subscriber lines Interference cancellation Resource utilization degradation of performance crosstalk Simulation results management of resources interference interference

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An Adaptive Method for Multi-User MIMO Power Controlled Systems

An Adaptive Method for Multi-User MIMO Power Controlled Syst...

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2010 IEEE International Conference Conferenhce on Wireless Communications,Networking and Information Security(2010 IEEE 无线通信、网络技术与信息安全国际会议 WCNIS)

作者： Mahdi Kashiha Mehrdad Ardebilipour Ehsan Soleimani-Nasab Faculty of Electrical & Computer Engineering K.N. Toosi University of Technology Tehran Iran

For achieving high performance at wireless networks, we can use Multiple-Input Multiple-Output systems (MIMO). By using channel information at Base Station or Mobile Station we can remove or mitigate inter-user interference at multi-user MIMO systems. For designing of Mu-MIMO system we must attend to inter-user interference problem which can reduce performance and capacity of systems. capacity optimization, maximizing throughput under power restriction, power control problems or power minimization under satisfying minimum quality of service are some sample of such problem. None of them has closed form unless by applying some restriction at them. In this paper, we solve some of them by using block diagonalization and successive optimization methods with equal & adaptive power allocation methods.

关键词： MIMO BC pre-coding BD SO

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BD precoding SCHEMES FOR COGNITIVE MIMO SYSTEM

BD PRECODING SCHEMES FOR COGNITIVE MIMO SYSTEM

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2009 IEEE International Conference on Network Infrastructure and Digital Content(2009年IEEE网络基础设施与数字内容国际会议 IEEE IC-NIDC2009)

作者： Caihong Zhang Li Guo Laboratory of Digital Signal Processing Beijing University of Posts and Telecommunications

This paper focuses on pre-coding schemes for the downlink of multiple user multi-input multi-output (MU-MIMO) system in cognitive radio (CR) network. The spectrum band can be utilized by allowing a number of cognitive users to coexist with primary users (PUs) through a pre-coding scheme. The capacity problems maximize the sum rate of CUs subject to the interference constraint for PUs and total transmitted power constraint can be solved with high complexity. To simplify the problem, this paper presents two suboptimal precoding schemes that pre-cancel the co-channel interference to PUs as well as mitigate interference between cognitive users (CUs). Simulation results show that the two suboptimal algorithms are able to achieve high sum rate throughput with low complexity.

关键词： pre-coding cognitive radio BD MUMIMO

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防止RaptorQ code中的線性相依攻擊

防止RaptorQ code中的線性相依攻擊

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作者：阮昱奇逢甲大學

学位级别：碩士

越来越多的网路服务出现，线上串流影音服务则是现在最多人使用的服务。许多的编码技术相继产生，Raptor Code为一种日渐发展成熟的编码技术，Raptor Code能产生Source Symbols以及Repair Symbols，接收方只需要接收到足够的Symbols便... 详细信息

越来越多的网路服务出现，线上串流影音服务则是现在最多人使用的服务。许多的编码技术相继产生，Raptor Code为一种日渐发展成熟的编码技术，Raptor Code能产生Source Symbols以及Repair Symbols，接收方只需要接收到足够的Symbols便能成功解码，如果有Source Symbols遗失也能利用Repair Symbols来替补。Raptor code有优点但也存在着安全性漏洞，透过拦截封包来预先运算Source Symbols以及Repair Symbols的相关性，可以利用丢弃封包来达到攻击。本篇论文利用Diffie-Hellman的方法来使接收端以及发送端共同得到一把金钥，并利用这把金钥来打乱Raptor Code编码时产生的矩阵，利用打乱矩阵来使攻击者无法轻易分析出Source Symbols以及Repair Symbols的相关性。透过实验数据得知造成了少许的成本增加，但对於实用性的时间考量内是可接受的，因此证明本篇论文的方法能达到安全性以及实用性的体现。

关键词： Fountain Code Raptor Code pre-coding Diffie-Hellman

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BD precoding SCHEMES FOR COGNITIVE MIMO SYSTEM

BD PRECODING SCHEMES FOR COGNITIVE MIMO SYSTEM

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2009 IEEE International Conference on Network Infrastructure and Digital Content（IC-NIDC 2009）

作者： Caihong Zhang,Li Guo Laboratory of Digital Signal Processing,Beijing University of Posts and Telecommunications

This paper focuses on pre-coding schemes for the downlink of multiple user multi-input multi-output (MU-MIMO) system in cognitive radio (CR) *** spectrum band can be utilized by allowing a number of cognitive users to coexist with primary users (PUs) through a pre-coding *** capacity problems maximize the sum rate of CUs subject to the interference constraint for PUs and total transmitted power constraint can be solved with high *** simplify the problem,this paper presents two suboptimal precoding schemes that pre-cancel the co-channel interference to PUs as well as mitigate interference between cognitive users (CUs).Simulation results show that the two suboptimal algorithms are able to achieve high sum rate throughput with low complexity.

关键词： pre-coding cognitive radio BD MU- MIMO

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UPLINK SINGLE-USER MIMO FOR 3GPP LTE

UPLINK SINGLE-USER MIMO FOR 3GPP LTE

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18th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2007), vol.2

作者： Donald M. Grieco Kyle Jung-Lin Pan Robert Lind Olesen Nirav Shah InterDigital Communication Corporation Melville USA

In this paper a multiple-input multiple-output (MIMO) scheme proposed for single carrier frequency division multiple access (SC-FDMA) system is described. Transmit and receive algorithms are developed for SC-FDMA MIMO systems. A spatial precoding closed-loop transmit beamforming (TxBF) algorithm for SC-FDMA MIMO system which uses singular value decomposition (SVD) at the transmitter and linear minimum mean square error (LMMSE) equalization at the receiver is described. Quantization and feedback schemes to support closed-loop operation are discussed. The PAPR effects and a mitigation approach are presented. Simulation results are shown for throughput vs. signal-to-noise ratio (SNR). The performance for this new TxBF algorithm is compared to Single-Input-Multiple Output (SIMO) performance. Also, single and dual-codeword performance is considered.

关键词： MIMO Beamforming pre-coding SC-FDMA Diversity Space time coding Space frequency coding Feedback Complexity PAPR

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